2 * Copyright (C) 2009 Dan Carpenter.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
19 * There are several types of function hooks.
21 * The param_key hooks are probably the right things to use going forward.
22 * They give you a name/sym pair so it means less code in the checks.
24 * The add_function_hook() functions are trigger for every call. The
25 * "return_implies" are triggered for specific return ranges. The "exact"
26 * variants will be triggered if it's *definitely* in the range where the
27 * others will be triggered if it's *possibly* in the range. The "late"
28 * variants will be triggered after the others have run.
30 * There are a few miscellaneous things like add_function_assign_hook() and
31 * add_macro_assign_hook() which are only triggered for assignments. The
32 * add_implied_return_hook() let's you manually adjust the return range.
35 * add_function_param_key_hook_early()
36 * add_function_param_key_hook()
37 * add_function_param_key_hook_late()
38 * add_param_key_expr_hook()
39 * add_function_hook_early()
42 * Just for some return ranges:
43 * return_implies_param_key()
44 * return_implies_param_key_expr()
45 * return_implies_param_key_exact()
46 * return_implies_state()
47 * select_return_param_key() (It's weird that this is not in smatch_db.c)
50 * add_function_assign_hook()
52 * For Macro Assignments:
53 * add_macro_assign_hook()
55 * Manipulate the return range.
56 * add_implied_return_hook()
63 #include "smatch_slist.h"
64 #include "smatch_extra.h"
65 #include "smatch_function_hashtable.h"
66 #include "smatch_expression_stacks.h"
70 struct data_range
*range
;
73 implication_hook
*ranged
;
74 implied_return_hook
*implied_return
;
79 ALLOCATOR(fcall_back
, "call backs");
80 DECLARE_PTR_LIST(call_back_list
, struct fcall_back
);
82 DEFINE_FUNCTION_HASHTABLE_STATIC(callback
, struct fcall_back
, struct call_back_list
);
83 static struct hashtable
*func_hash
;
85 int __in_fake_parameter_assign
;
99 struct param_key_data
{
100 param_key_hook
*call_back
;
108 expr_func
*call_back
;
113 struct return_implies_callback
{
117 return_implies_hook
*callback
;
118 param_key_hook
*pk_callback
;
121 ALLOCATOR(return_implies_callback
, "return_implies callbacks");
122 DECLARE_PTR_LIST(db_implies_list
, struct return_implies_callback
);
123 static struct db_implies_list
*db_return_states_list
;
125 static struct void_fn_list
*return_states_before
;
126 static struct void_fn_list
*return_states_after
;
127 static struct string_hook_list
*return_string_hooks
;
129 struct db_callback_info
{
132 struct expression
*expr
;
133 struct range_list
*rl
;
136 struct stree
*implied
;
137 struct db_implies_list
*callbacks
;
138 struct db_implies_list
*called
;
144 struct smatch_state
*ret_state
;
145 struct expression
*var_expr
;
146 struct expression_list
*fake_param_assign_stack
;
150 static struct expression_list
*fake_calls
;
152 void add_fake_call_after_return(struct expression
*call
)
154 add_ptr_list(&fake_calls
, call
);
157 static void parse_fake_calls(void)
159 struct expression_list
*list
;
160 struct expression
*call
;
165 FOR_EACH_PTR(list
, call
) {
167 } END_FOR_EACH_PTR(call
);
169 __free_ptr_list((struct ptr_list
**)&list
);
172 static struct fcall_back
*alloc_fcall_back(int type
, void *call_back
,
175 struct fcall_back
*cb
;
177 cb
= __alloc_fcall_back(0);
179 cb
->u
.call_back
= call_back
;
184 static const char *get_fn_name(struct expression
*fn
)
189 if (fn
->type
== EXPR_SYMBOL
&& fn
->symbol
)
190 return fn
->symbol
->ident
->name
;
191 return get_member_name(fn
);
194 static struct call_back_list
*get_call_backs(const char *fn_name
)
198 return search_callback(func_hash
, (char *)fn_name
);
201 void add_function_hook(const char *look_for
, func_hook
*call_back
, void *info
)
203 struct fcall_back
*cb
;
205 cb
= alloc_fcall_back(REGULAR_CALL
, call_back
, info
);
206 add_callback(func_hash
, look_for
, cb
);
209 void add_function_hook_early(const char *look_for
, func_hook
*call_back
, void *info
)
211 struct fcall_back
*cb
;
213 cb
= alloc_fcall_back(REGULAR_CALL_EARLY
, call_back
, info
);
214 add_callback(func_hash
, look_for
, cb
);
217 void add_function_hook_late(const char *look_for
, func_hook
*call_back
, void *info
)
219 struct fcall_back
*cb
;
221 cb
= alloc_fcall_back(REGULAR_CALL_LATE
, call_back
, info
);
222 add_callback(func_hash
, look_for
, cb
);
225 void add_function_assign_hook(const char *look_for
, func_hook
*call_back
,
228 struct fcall_back
*cb
;
230 cb
= alloc_fcall_back(ASSIGN_CALL
, call_back
, info
);
231 add_callback(func_hash
, look_for
, cb
);
234 static void register_funcs_from_file_helper(const char *file
,
235 func_hook
*call_back
, void *info
,
242 snprintf(name
, sizeof(name
), "%s.%s", option_project_str
, file
);
243 token
= get_tokens_file(name
);
246 if (token_type(token
) != TOKEN_STREAMBEGIN
)
249 while (token_type(token
) != TOKEN_STREAMEND
) {
250 if (token_type(token
) != TOKEN_IDENT
)
252 func
= show_ident(token
->ident
);
254 add_function_assign_hook(func
, call_back
, info
);
256 add_function_hook(func
, call_back
, info
);
262 void register_func_hooks_from_file(const char *file
,
263 func_hook
*call_back
, void *info
)
265 register_funcs_from_file_helper(file
, call_back
, info
, false);
268 void register_assign_hooks_from_file(const char *file
,
269 func_hook
*call_back
, void *info
)
271 register_funcs_from_file_helper(file
, call_back
, info
, true);
274 void add_implied_return_hook(const char *look_for
,
275 implied_return_hook
*call_back
,
278 struct fcall_back
*cb
;
280 cb
= alloc_fcall_back(IMPLIED_RETURN
, call_back
, info
);
281 add_callback(func_hash
, look_for
, cb
);
284 static void db_helper(struct expression
*expr
, param_key_hook
*call_back
, int param
, const char *key
, void *info
)
290 call_back(expr
, key
, NULL
, info
);
294 name
= get_name_sym_from_param_key(expr
, param
, key
, &sym
);
298 call_back(expr
, name
, sym
, info
);
303 static struct expression
*get_parent_assignment(struct expression
*expr
)
305 struct expression
*parent
;
308 if (expr
->type
== EXPR_ASSIGNMENT
)
311 parent
= expr_get_fake_parent_expr(expr
);
312 if (parent
&& parent
->type
== EXPR_ASSIGNMENT
)
317 parent
= expr_get_parent_expr(parent
);
318 if (!parent
|| ++cnt
>= 5)
320 if (parent
->type
== EXPR_CAST
)
322 if (parent
->type
== EXPR_PREOP
&& parent
->op
== '(')
327 if (parent
&& parent
->type
== EXPR_ASSIGNMENT
)
332 static void param_key_function(const char *fn
, struct expression
*expr
, void *data
)
334 struct param_key_data
*pkd
= data
;
335 struct expression
*parent
;
337 parent
= get_parent_assignment(expr
);
341 db_helper(expr
, pkd
->call_back
, pkd
->param
, pkd
->key
, pkd
->info
);
344 static void param_key_expr_function(const char *fn
, struct expression
*expr
, void *data
)
346 struct param_key_data
*pkd
= data
;
347 struct expression
*parent
, *arg
;
349 parent
= get_parent_assignment(expr
);
353 arg
= gen_expr_from_param_key(expr
, pkd
->param
, pkd
->key
);
359 static void param_key_implies_function(const char *fn
, struct expression
*call_expr
,
360 struct expression
*assign_expr
, void *data
)
362 struct param_key_data
*pkd
= data
;
364 db_helper(assign_expr
?: call_expr
, pkd
->call_back
, pkd
->param
, pkd
->key
, pkd
->info
);
367 static void param_key_expr_implies_function(const char *fn
, struct expression
*call_expr
,
368 struct expression
*assign_expr
, void *data
)
370 struct param_key_data
*pkd
= data
;
371 struct expression
*arg
;
373 arg
= gen_expr_from_param_key(assign_expr
?: call_expr
, pkd
->param
, pkd
->key
);
379 static struct param_key_data
*alloc_pkd(param_key_hook
*call_back
, int param
, const char *key
, void *info
)
381 struct param_key_data
*pkd
;
383 pkd
= malloc(sizeof(*pkd
));
384 pkd
->call_back
= call_back
;
386 pkd
->key
= alloc_string(key
);
392 static struct param_key_data
*alloc_pked(expr_func
*call_back
, int param
, const char *key
, void *info
)
394 struct param_key_data
*pkd
;
396 pkd
= alloc_pkd(NULL
, param
, key
, info
);
397 pkd
->expr_fn
= call_back
;
402 void add_function_param_key_hook_early(const char *look_for
, param_key_hook
*call_back
,
403 int param
, const char *key
, void *info
)
405 struct param_key_data
*pkd
;
408 printf("pointless early hook for '%s'", look_for
);
412 pkd
= alloc_pkd(call_back
, param
, key
, info
);
413 add_function_hook_early(look_for
, ¶m_key_function
, pkd
);
416 void add_function_param_key_hook(const char *look_for
, param_key_hook
*call_back
,
417 int param
, const char *key
, void *info
)
419 struct param_key_data
*pkd
;
421 pkd
= alloc_pkd(call_back
, param
, key
, info
);
423 add_function_assign_hook(look_for
, ¶m_key_function
, pkd
);
425 add_function_hook(look_for
, ¶m_key_function
, pkd
);
428 void add_param_key_expr_hook(const char *look_for
, expr_func
*call_back
,
429 int param
, const char *key
, void *info
)
431 struct param_key_data
*pkd
;
433 pkd
= alloc_pked(call_back
, param
, key
, info
);
436 add_function_assign_hook(look_for
, ¶m_key_expr_function
, pkd
);
438 add_function_hook(look_for
, ¶m_key_expr_function
, pkd
);
441 void add_function_param_key_hook_late(const char *look_for
, param_key_hook
*call_back
,
442 int param
, const char *key
, void *info
)
444 struct param_key_data
*pkd
;
446 pkd
= alloc_pkd(call_back
, param
, key
, info
);
447 add_function_hook_late(look_for
, ¶m_key_function
, pkd
);
450 void return_implies_param_key(const char *look_for
, sval_t start
, sval_t end
,
451 param_key_hook
*call_back
,
452 int param
, const char *key
, void *info
)
454 struct param_key_data
*pkd
;
456 pkd
= alloc_pkd(call_back
, param
, key
, info
);
457 return_implies_state_sval(look_for
, start
, end
, ¶m_key_implies_function
, pkd
);
460 void return_implies_param_key_exact(const char *look_for
, sval_t start
, sval_t end
,
461 param_key_hook
*call_back
,
462 int param
, const char *key
, void *info
)
464 struct param_key_data
*pkd
;
466 pkd
= alloc_pkd(call_back
, param
, key
, info
);
467 return_implies_exact(look_for
, start
, end
, ¶m_key_implies_function
, pkd
);
470 void return_implies_param_key_expr(const char *look_for
, sval_t start
, sval_t end
,
471 expr_func
*call_back
,
472 int param
, const char *key
, void *info
)
474 struct param_key_data
*pkd
;
476 pkd
= alloc_pked(call_back
, param
, key
, info
);
477 return_implies_state_sval(look_for
, start
, end
, ¶m_key_expr_implies_function
, pkd
);
480 void add_macro_assign_hook(const char *look_for
, func_hook
*call_back
,
483 struct fcall_back
*cb
;
485 cb
= alloc_fcall_back(MACRO_ASSIGN
, call_back
, info
);
486 add_callback(func_hash
, look_for
, cb
);
489 void add_macro_assign_hook_extra(const char *look_for
, func_hook
*call_back
,
492 struct fcall_back
*cb
;
494 cb
= alloc_fcall_back(MACRO_ASSIGN_EXTRA
, call_back
, info
);
495 add_callback(func_hash
, look_for
, cb
);
498 void return_implies_state(const char *look_for
, long long start
, long long end
,
499 implication_hook
*call_back
, void *info
)
501 struct fcall_back
*cb
;
503 cb
= alloc_fcall_back(RANGED_CALL
, call_back
, info
);
504 cb
->range
= alloc_range_perm(ll_to_sval(start
), ll_to_sval(end
));
505 add_callback(func_hash
, look_for
, cb
);
508 void return_implies_state_sval(const char *look_for
, sval_t start
, sval_t end
,
509 implication_hook
*call_back
, void *info
)
511 struct fcall_back
*cb
;
513 cb
= alloc_fcall_back(RANGED_CALL
, call_back
, info
);
514 cb
->range
= alloc_range_perm(start
, end
);
515 add_callback(func_hash
, look_for
, cb
);
518 void return_implies_exact(const char *look_for
, sval_t start
, sval_t end
,
519 implication_hook
*call_back
, void *info
)
521 struct fcall_back
*cb
;
523 cb
= alloc_fcall_back(RANGED_EXACT
, call_back
, info
);
524 cb
->range
= alloc_range_perm(start
, end
);
525 add_callback(func_hash
, look_for
, cb
);
528 static struct return_implies_callback
*alloc_db_return_callback(int type
, bool param_key
, void *callback
)
530 struct return_implies_callback
*cb
;
532 cb
= __alloc_return_implies_callback(0);
534 cb
->param_key
= param_key
;
535 cb
->callback
= callback
;
540 void select_return_states_hook(int type
, return_implies_hook
*callback
)
542 struct return_implies_callback
*cb
;
544 cb
= alloc_db_return_callback(type
, false, callback
);
545 add_ptr_list(&db_return_states_list
, cb
);
548 static void call_db_return_callback(struct db_callback_info
*db_info
,
549 struct return_implies_callback
*cb
,
550 int param
, char *key
, char *value
)
553 db_helper(db_info
->expr
, cb
->pk_callback
, param
, key
, NULL
);
554 add_ptr_list(&db_info
->called
, cb
);
556 cb
->callback(db_info
->expr
, param
, key
, value
);
560 void select_return_param_key(int type
, param_key_hook
*callback
)
562 struct return_implies_callback
*cb
;
564 cb
= alloc_db_return_callback(type
, true, callback
);
565 add_ptr_list(&db_return_states_list
, cb
);
568 void select_return_states_before(void_fn
*fn
)
570 add_ptr_list(&return_states_before
, fn
);
573 void select_return_states_after(void_fn
*fn
)
575 add_ptr_list(&return_states_after
, fn
);
578 void add_return_string_hook(string_hook
*fn
)
580 add_ptr_list(&return_string_hooks
, fn
);
583 static bool call_call_backs(struct call_back_list
*list
, int type
,
584 const char *fn
, struct expression
*expr
)
586 struct fcall_back
*tmp
;
587 bool handled
= false;
589 FOR_EACH_PTR(list
, tmp
) {
590 if (tmp
->type
== type
) {
591 (tmp
->u
.call_back
)(fn
, expr
, tmp
->info
);
594 } END_FOR_EACH_PTR(tmp
);
599 static void call_function_hooks(struct expression
*expr
, enum fn_hook_type type
)
601 struct call_back_list
*call_backs
;
604 while (expr
->type
== EXPR_ASSIGNMENT
)
605 expr
= strip_expr(expr
->right
);
606 if (expr
->type
!= EXPR_CALL
)
609 fn_name
= get_fn_name(expr
->fn
);
610 call_backs
= get_call_backs(fn_name
);
614 call_call_backs(call_backs
, type
, fn_name
, expr
);
617 static void call_return_states_after_hooks(struct expression
*expr
)
619 call_void_fns(return_states_after
);
620 __pass_to_client(expr
, FUNCTION_CALL_HOOK_AFTER_DB
);
621 call_function_hooks(expr
, REGULAR_CALL_LATE
);
624 static void call_ranged_call_backs(struct call_back_list
*list
,
625 const char *fn
, struct expression
*call_expr
,
626 struct expression
*assign_expr
)
628 struct fcall_back
*tmp
;
630 FOR_EACH_PTR(list
, tmp
) {
631 (tmp
->u
.ranged
)(fn
, call_expr
, assign_expr
, tmp
->info
);
632 } END_FOR_EACH_PTR(tmp
);
635 static struct call_back_list
*get_same_ranged_call_backs(struct call_back_list
*list
,
636 struct data_range
*drange
)
638 struct call_back_list
*ret
= NULL
;
639 struct fcall_back
*tmp
;
641 FOR_EACH_PTR(list
, tmp
) {
642 if (tmp
->type
!= RANGED_CALL
&&
643 tmp
->type
!= RANGED_EXACT
)
645 if (ranges_equiv(tmp
->range
, drange
))
646 add_ptr_list(&ret
, tmp
);
647 } END_FOR_EACH_PTR(tmp
);
651 static bool in_list_exact_sval(struct range_list
*list
, struct data_range
*drange
)
653 struct data_range
*tmp
;
655 FOR_EACH_PTR(list
, tmp
) {
656 if (ranges_equiv(tmp
, drange
))
658 } END_FOR_EACH_PTR(tmp
);
663 * The assign_ranged_funcs() function is called when we have no data from the DB.
665 static bool assign_ranged_funcs(const char *fn
, struct expression
*expr
,
666 struct call_back_list
*call_backs
)
668 struct fcall_back
*tmp
;
672 struct smatch_state
*estate
;
673 struct stree
*tmp_stree
;
674 struct stree
*final_states
= NULL
;
675 struct range_list
*handled_ranges
= NULL
;
676 struct range_list
*unhandled_rl
;
677 struct call_back_list
*same_range_call_backs
= NULL
;
678 struct expression
*call
;
679 struct range_list
*rl
;
685 var_name
= expr_to_var_sym(expr
->left
, &sym
);
686 if (!var_name
|| !sym
)
689 call
= strip_expr(expr
->right
);
691 FOR_EACH_PTR(call_backs
, tmp
) {
692 if (tmp
->type
!= RANGED_CALL
&&
693 tmp
->type
!= RANGED_EXACT
)
696 if (in_list_exact_sval(handled_ranges
, tmp
->range
))
698 __push_fake_cur_stree();
699 tack_on(&handled_ranges
, tmp
->range
);
701 same_range_call_backs
= get_same_ranged_call_backs(call_backs
, tmp
->range
);
702 call_ranged_call_backs(same_range_call_backs
, fn
, expr
->right
, expr
);
703 __free_ptr_list((struct ptr_list
**)&same_range_call_backs
);
705 rl
= alloc_rl(tmp
->range
->min
, tmp
->range
->max
);
706 rl
= cast_rl(get_type(expr
->left
), rl
);
707 estate
= alloc_estate_rl(rl
);
708 set_extra_mod(var_name
, sym
, expr
->left
, estate
);
710 tmp_stree
= __pop_fake_cur_stree();
711 merge_fake_stree(&final_states
, tmp_stree
);
712 free_stree(&tmp_stree
);
714 } END_FOR_EACH_PTR(tmp
);
716 unhandled_rl
= rl_filter(alloc_whole_rl(get_type(call
)), handled_ranges
);
718 __push_fake_cur_stree();
719 rl
= cast_rl(get_type(expr
->left
), unhandled_rl
);
720 estate
= alloc_estate_rl(rl
);
721 set_extra_mod(var_name
, sym
, expr
->left
, estate
);
722 tmp_stree
= __pop_fake_cur_stree();
723 merge_fake_stree(&final_states
, tmp_stree
);
724 free_stree(&tmp_stree
);
727 FOR_EACH_SM(final_states
, sm
) {
729 } END_FOR_EACH_SM(sm
);
731 free_stree(&final_states
);
733 free_string(var_name
);
737 static void call_implies_callbacks(int comparison
, struct expression
*expr
, sval_t sval
, int left
, struct stree
**implied_true
, struct stree
**implied_false
)
739 struct call_back_list
*call_backs
;
740 struct fcall_back
*tmp
;
742 struct data_range
*value_range
;
743 struct stree
*true_states
= NULL
;
744 struct stree
*false_states
= NULL
;
745 struct stree
*tmp_stree
;
747 *implied_true
= NULL
;
748 *implied_false
= NULL
;
749 fn_name
= get_fn_name(expr
->fn
);
750 call_backs
= get_call_backs(fn_name
);
753 value_range
= alloc_range(sval
, sval
);
755 /* set true states */
756 __push_fake_cur_stree();
757 FOR_EACH_PTR(call_backs
, tmp
) {
758 if (tmp
->type
!= RANGED_CALL
&&
759 tmp
->type
!= RANGED_EXACT
)
761 if (!true_comparison_range_LR(comparison
, tmp
->range
, value_range
, left
))
763 (tmp
->u
.ranged
)(fn_name
, expr
, NULL
, tmp
->info
);
764 } END_FOR_EACH_PTR(tmp
);
765 tmp_stree
= __pop_fake_cur_stree();
766 merge_fake_stree(&true_states
, tmp_stree
);
767 free_stree(&tmp_stree
);
769 /* set false states */
770 __push_fake_cur_stree();
771 FOR_EACH_PTR(call_backs
, tmp
) {
772 if (tmp
->type
!= RANGED_CALL
&&
773 tmp
->type
!= RANGED_EXACT
)
775 if (!false_comparison_range_LR(comparison
, tmp
->range
, value_range
, left
))
777 (tmp
->u
.ranged
)(fn_name
, expr
, NULL
, tmp
->info
);
778 } END_FOR_EACH_PTR(tmp
);
779 tmp_stree
= __pop_fake_cur_stree();
780 merge_fake_stree(&false_states
, tmp_stree
);
781 free_stree(&tmp_stree
);
783 *implied_true
= true_states
;
784 *implied_false
= false_states
;
787 static void set_implied_states(struct db_callback_info
*db_info
)
791 FOR_EACH_SM(db_info
->implied
, sm
) {
793 } END_FOR_EACH_SM(sm
);
795 free_stree(&db_info
->implied
);
798 static void store_return_state(struct db_callback_info
*db_info
, const char *ret_str
, struct smatch_state
*state
)
800 db_info
->ret_str
= alloc_sname(ret_str
),
801 db_info
->ret_state
= state
;
804 static struct expression_list
*unfaked_calls
;
806 struct expression
*get_unfaked_call(void)
808 return last_ptr_list((struct ptr_list
*)unfaked_calls
);
811 static void store_unfaked_call(struct expression
*expr
)
813 push_expression(&unfaked_calls
, expr
);
816 static void clear_unfaked_call(void)
818 delete_ptr_list_last((struct ptr_list
**)&unfaked_calls
);
821 void fake_param_assign_helper(struct expression
*call
, struct expression
*fake_assign
, bool shallow
)
823 store_unfaked_call(call
);
824 __in_fake_parameter_assign
++;
825 parse_assignment(fake_assign
, true);
826 __in_fake_parameter_assign
--;
827 clear_unfaked_call();
830 static bool fake_a_param_assignment(struct expression
*expr
, const char *ret_str
, struct smatch_state
*orig
)
832 struct expression
*arg
, *left
, *right
, *tmp
, *fake_assign
;
838 if (expr
->type
!= EXPR_ASSIGNMENT
|| expr
->op
!= '=')
843 while (right
->type
== EXPR_ASSIGNMENT
)
844 right
= strip_expr(right
->right
);
845 if (!right
|| right
->type
!= EXPR_CALL
)
848 p
= strchr(ret_str
, '[');
853 if (p
[0] == '=' && p
[1] == '=')
858 snprintf(buf
, sizeof(buf
), "%s", p
);
862 param
= strtol(p
, &p
, 10);
869 arg
= get_argument_from_call_expr(right
->args
, param
);
873 /* There should be a get_other_name() function which returns an expr */
874 tmp
= get_assigned_expr(arg
);
879 * This is a sanity check to prevent side effects from evaluating stuff
882 str
= expr_to_chunk_sym_vsl(arg
, NULL
, NULL
);
887 right
= gen_expression_from_key(arg
, buf
);
888 if (!right
) /* Mostly fails for binops like [$0 + 4032] */
890 fake_assign
= assign_expression(left
, '=', right
);
891 fake_param_assign_helper(expr
, fake_assign
, false);
894 * If the return is "0-65531[$0->nla_len - 4]" the faked expression
895 * is maybe (-4)-65531 but we know it is in the 0-65531 range so both
896 * parts have to be considered. We use _nomod() because it's not really
897 * another modification, it's just a clarification.
900 if (estate_rl(orig
)) {
901 struct smatch_state
*faked
;
902 struct range_list
*rl
;
904 faked
= get_extra_state(left
);
905 if (estate_rl(faked
)) {
906 rl
= rl_intersection(estate_rl(faked
), estate_rl(orig
));
908 set_extra_expr_nomod(left
, alloc_estate_rl(rl
));
915 static void fake_return_assignment(struct db_callback_info
*db_info
, int type
, int param
, char *key
, char *value
)
917 struct expression
*call
, *left
, *right
, *assign
;
920 if (type
!= PARAM_COMPARE
)
923 call
= db_info
->expr
;
924 while (call
&& call
->type
== EXPR_ASSIGNMENT
)
925 call
= strip_expr(call
->right
);
926 if (!call
|| call
->type
!= EXPR_CALL
)
929 // TODO: This only handles "$->foo = arg" and not "$->foo = arg->bar".
932 if (!value
|| strncmp(value
, "== $", 4) != 0)
934 if (!isdigit(value
[4]) || value
[5] != '\0')
936 right_param
= atoi(value
+ 4);
938 left
= gen_expr_from_param_key(db_info
->expr
, param
, key
);
941 right
= get_argument_from_call_expr(call
->args
, right_param
);
943 assign
= assign_expression(left
, '=', right
);
944 push_expression(&db_info
->fake_param_assign_stack
, assign
);
947 static void set_fresh_mtag_returns(struct db_callback_info
*db_info
)
949 struct expression
*expr
;
950 struct smatch_state
*state
;
952 if (!db_info
->ret_state
)
955 if (!db_info
->expr
||
956 db_info
->expr
->type
!= EXPR_ASSIGNMENT
||
957 db_info
->expr
->op
!= '=')
960 expr
= db_info
->expr
->left
;
962 state
= alloc_estate_rl(cast_rl(get_type(expr
), clone_rl(estate_rl(db_info
->ret_state
))));
963 state
= get_mtag_return(db_info
->expr
, state
);
967 set_real_absolute(expr
, state
);
968 set_extra_expr_mod(expr
, state
);
971 static void set_return_assign_state(struct db_callback_info
*db_info
)
973 struct expression
*expr
= db_info
->expr
->left
;
974 struct expression
*fake_assign
;
975 struct smatch_state
*state
;
976 bool was_set
= false;
978 if (!db_info
->ret_state
)
981 state
= alloc_estate_rl(cast_rl(get_type(expr
), clone_rl(estate_rl(db_info
->ret_state
))));
982 if (!fake_a_param_assignment(db_info
->expr
, db_info
->ret_str
, state
)) {
983 set_extra_expr_mod(expr
, state
);
987 while ((fake_assign
= pop_expression(&db_info
->fake_param_assign_stack
))) {
988 struct range_list
*left
, *right
;
991 * Originally, I tried to do this as a assignment to record that
992 * a = frob(b) implies that "a->foo == b->foo" etc. But that
993 * caused a problem because then it was recorded that "a->foo"
994 * was modified and recorded as a PARAM_SET in the database.
996 * So now, instead of faking an assignment we use
997 * set_extra_expr_nomod() but it's still recorded as an
998 * assignment in the ->fake_param_assign_stack for legacy
999 * reasons and because it's a handy way to store a left/right
1003 get_absolute_rl(fake_assign
->left
, &left
);
1004 get_absolute_rl(fake_assign
->right
, &right
);
1005 right
= cast_rl(get_type(fake_assign
->left
), right
);
1006 // FIXME: add some sanity checks
1007 // FIXME: preserve the sm state if possible
1008 set_extra_expr_nomod(fake_assign
->left
, alloc_estate_rl(right
));
1013 set_extra_expr_mod(expr
, state
);
1016 static void set_other_side_state(struct db_callback_info
*db_info
)
1018 struct expression
*expr
= db_info
->var_expr
;
1019 struct smatch_state
*state
;
1021 if (!db_info
->ret_state
)
1024 // TODO: faked_assign set ==$ equiv here
1026 state
= alloc_estate_rl(cast_rl(get_type(expr
), clone_rl(estate_rl(db_info
->ret_state
))));
1027 set_extra_expr_nomod(expr
, state
);
1028 db_info
->ret_state
= NULL
;
1029 db_info
->ret_str
= NULL
;
1032 static void handle_ret_equals_param(char *ret_string
, struct range_list
*rl
, struct expression
*call
)
1036 struct expression
*arg
;
1037 struct range_list
*orig
;
1039 // TODO: faked_assign This needs to be handled in the assignment code
1041 str
= strstr(ret_string
, "==$");
1045 param
= strtoll(str
, NULL
, 10);
1046 arg
= get_argument_from_call_expr(call
->args
, param
);
1049 get_absolute_rl(arg
, &orig
);
1050 rl
= rl_intersection(orig
, rl
);
1053 set_extra_expr_nomod(arg
, alloc_estate_rl(rl
));
1056 static bool impossible_limit(struct db_callback_info
*db_info
, int param
, char *key
, char *value
)
1058 struct expression
*expr
= db_info
->expr
;
1059 struct expression
*arg
;
1060 struct smatch_state
*state
;
1061 struct range_list
*passed
;
1062 struct range_list
*limit
;
1063 struct symbol
*compare_type
;
1065 while (expr
->type
== EXPR_ASSIGNMENT
)
1066 expr
= strip_expr(expr
->right
);
1067 if (expr
->type
!= EXPR_CALL
)
1070 arg
= get_argument_from_call_expr(expr
->args
, param
);
1074 if (strcmp(key
, "$") == 0) {
1075 if (!get_implied_rl(arg
, &passed
))
1078 compare_type
= get_arg_type(expr
->fn
, param
);
1083 name
= get_variable_from_key(arg
, key
, &sym
);
1087 state
= get_state(SMATCH_EXTRA
, name
, sym
);
1092 passed
= estate_rl(state
);
1093 if (!passed
|| is_whole_rl(passed
)) {
1098 compare_type
= get_member_type_from_key(arg
, key
);
1101 passed
= cast_rl(compare_type
, passed
);
1102 call_results_to_rl(expr
, compare_type
, value
, &limit
);
1103 if (!limit
|| is_whole_rl(limit
))
1105 if (possibly_true_rl(passed
, SPECIAL_EQUAL
, limit
))
1107 if (option_debug
|| local_debug
|| debug_db
)
1108 sm_msg("impossible: %d '%s' limit '%s' == '%s' return='%s'", param
, key
, show_rl(passed
), value
, db_info
->ret_str
);
1112 static bool is_impossible_data(int type
, struct db_callback_info
*db_info
, int param
, char *key
, char *value
)
1114 if (type
== PARAM_LIMIT
&& impossible_limit(db_info
, param
, key
, value
))
1116 if (type
== COMPARE_LIMIT
&& param_compare_limit_is_impossible(db_info
->expr
, param
, key
, value
)) {
1117 if (local_debug
|| debug_db
)
1118 sm_msg("param_compare_limit_is_impossible: %d %s %s", param
, key
, value
);
1124 static bool func_type_mismatch(struct expression
*expr
, const char *value
)
1126 struct symbol
*type
;
1128 /* This makes faking returns easier */
1129 if (!value
|| value
[0] == '\0')
1132 while (expr
->type
== EXPR_ASSIGNMENT
)
1133 expr
= strip_expr(expr
->right
);
1136 * Short cut: We only care about function pointers that are struct
1140 if (expr
->fn
->type
== EXPR_SYMBOL
)
1143 type
= get_type(expr
->fn
);
1146 if (type
->type
== SYM_PTR
)
1147 type
= get_real_base_type(type
);
1149 if (strcmp(type_to_str(type
), value
) == 0)
1155 static void process_return_states(struct db_callback_info
*db_info
)
1157 struct stree
*stree
;
1159 set_implied_states(db_info
);
1160 set_fresh_mtag_returns(db_info
);
1162 free_ptr_list(&db_info
->called
);
1163 stree
= __pop_fake_cur_stree();
1165 sm_msg("States from DB: %s expr='%s' ret_str='%s' rl='%s' state='%s'",
1166 db_info
->cull
? "Culling" : "Merging",
1167 expr_to_str(db_info
->expr
),
1168 db_info
->ret_str
, show_rl(db_info
->rl
),
1169 db_info
->ret_state
? db_info
->ret_state
->name
: "<none>");
1170 __print_stree(stree
);
1173 if (!db_info
->cull
) {
1174 merge_fake_stree(&db_info
->stree
, stree
);
1175 db_info
->states_merged
= true;
1179 db_info
->ret_state
= NULL
;
1180 db_info
->ret_str
= NULL
;
1183 static int db_compare_callback(void *_info
, int argc
, char **argv
, char **azColName
)
1185 struct db_callback_info
*db_info
= _info
;
1186 struct range_list
*var_rl
= db_info
->rl
;
1187 struct range_list
*ret_range
;
1189 char *ret_str
, *key
, *value
;
1190 struct return_implies_callback
*tmp
;
1197 return_id
= atoi(argv
[0]);
1199 type
= atoi(argv
[2]);
1200 param
= atoi(argv
[3]);
1204 db_info
->has_states
= 1;
1205 if (db_info
->prev_return_id
!= -1 && type
== INTERNAL
) {
1206 set_other_side_state(db_info
);
1207 process_return_states(db_info
);
1208 __push_fake_cur_stree();
1211 db_info
->prev_return_id
= return_id
;
1213 if (type
== INTERNAL
&& func_type_mismatch(db_info
->expr
, value
))
1217 if (type
== CULL_PATH
) {
1222 if (is_impossible_data(type
, db_info
, param
, key
, value
)) {
1227 call_results_to_rl(db_info
->expr
, get_type(strip_expr(db_info
->expr
)), ret_str
, &ret_range
);
1228 ret_range
= cast_rl(get_type(db_info
->expr
), ret_range
);
1230 ret_range
= alloc_whole_rl(get_type(db_info
->expr
));
1232 comparison
= db_info
->comparison
;
1234 comparison
= flip_comparison(comparison
);
1236 if (db_info
->true_side
) {
1237 if (!possibly_true_rl(var_rl
, comparison
, ret_range
))
1239 if (type
== PARAM_LIMIT
)
1240 param_limit_implications(db_info
->expr
, param
, key
, value
, &db_info
->implied
);
1241 else if (type
> PARAM_LIMIT
)
1242 set_implied_states(db_info
);
1243 filter_by_comparison(&var_rl
, comparison
, ret_range
);
1244 filter_by_comparison(&ret_range
, flip_comparison(comparison
), var_rl
);
1246 if (!possibly_false_rl(var_rl
, comparison
, ret_range
))
1248 if (type
== PARAM_LIMIT
)
1249 param_limit_implications(db_info
->expr
, param
, key
, value
, &db_info
->implied
);
1250 else if (type
> PARAM_LIMIT
)
1251 set_implied_states(db_info
);
1252 filter_by_comparison(&var_rl
, negate_comparison(comparison
), ret_range
);
1253 filter_by_comparison(&ret_range
, flip_comparison(negate_comparison(comparison
)), var_rl
);
1256 handle_ret_equals_param(ret_str
, ret_range
, db_info
->expr
);
1258 if (type
== INTERNAL
) {
1259 set_state(-1, "unnull_path", NULL
, &true_state
);
1260 call_string_hooks(return_string_hooks
, db_info
->expr
, ret_str
);
1261 store_return_state(db_info
, ret_str
, alloc_estate_rl(clone_rl(var_rl
)));
1264 FOR_EACH_PTR(db_info
->callbacks
, tmp
) {
1265 if (tmp
->type
== type
)
1266 call_db_return_callback(db_info
, tmp
, param
, key
, value
);
1267 } END_FOR_EACH_PTR(tmp
);
1269 fake_return_assignment(db_info
, type
, param
, key
, value
);
1274 static void compare_db_return_states_callbacks(struct expression
*left
, int comparison
, struct expression
*right
, struct stree
*implied_true
, struct stree
*implied_false
)
1276 struct stree
*orig_states
;
1277 struct stree
*true_states
;
1278 struct stree
*false_states
;
1279 struct sm_state
*sm
;
1280 struct db_callback_info db_info
= {};
1281 struct expression
*var_expr
;
1282 struct expression
*call_expr
;
1283 struct range_list
*rl
;
1286 orig_states
= clone_stree(__get_cur_stree());
1288 /* legacy cruft. need to fix call_implies_callbacks(). */
1292 if (left
->type
!= EXPR_CALL
) {
1298 get_absolute_rl(var_expr
, &rl
);
1300 db_info
.comparison
= comparison
;
1301 db_info
.expr
= call_expr
;
1303 db_info
.left
= call_on_left
;
1304 db_info
.callbacks
= db_return_states_list
;
1305 db_info
.var_expr
= var_expr
;
1307 call_void_fns(return_states_before
);
1309 db_info
.true_side
= 1;
1310 db_info
.stree
= NULL
;
1311 db_info
.prev_return_id
= -1;
1312 __push_fake_cur_stree();
1313 sql_select_return_states("return_id, return, type, parameter, key, value",
1314 call_expr
, db_compare_callback
, &db_info
);
1315 set_other_side_state(&db_info
);
1316 process_return_states(&db_info
);
1317 true_states
= db_info
.stree
;
1318 if (!true_states
&& db_info
.has_states
) {
1319 __push_fake_cur_stree();
1320 set_path_impossible();
1321 true_states
= __pop_fake_cur_stree();
1326 FOR_EACH_SM(orig_states
, sm
) {
1327 __set_sm_cur_stree(sm
);
1328 } END_FOR_EACH_SM(sm
);
1330 db_info
.true_side
= 0;
1331 db_info
.stree
= NULL
;
1332 db_info
.prev_return_id
= -1;
1334 __push_fake_cur_stree();
1335 sql_select_return_states("return_id, return, type, parameter, key, value", call_expr
,
1336 db_compare_callback
, &db_info
);
1337 set_other_side_state(&db_info
);
1338 process_return_states(&db_info
);
1339 false_states
= db_info
.stree
;
1340 if (!false_states
&& db_info
.has_states
) {
1341 __push_fake_cur_stree();
1342 set_path_impossible();
1343 false_states
= __pop_fake_cur_stree();
1348 FOR_EACH_SM(orig_states
, sm
) {
1349 __set_sm_cur_stree(sm
);
1350 } END_FOR_EACH_SM(sm
);
1352 free_stree(&orig_states
);
1354 FOR_EACH_SM(true_states
, sm
) {
1355 __set_true_false_sm(sm
, NULL
);
1356 } END_FOR_EACH_SM(sm
);
1357 FOR_EACH_SM(false_states
, sm
) {
1358 __set_true_false_sm(NULL
, sm
);
1359 } END_FOR_EACH_SM(sm
);
1361 free_stree(&true_states
);
1362 free_stree(&false_states
);
1364 if (!db_info
.states_merged
)
1365 mark_call_params_untracked(call_expr
);
1367 call_return_states_after_hooks(call_expr
);
1369 FOR_EACH_SM(implied_true
, sm
) {
1370 __set_true_false_sm(sm
, NULL
);
1371 } END_FOR_EACH_SM(sm
);
1372 FOR_EACH_SM(implied_false
, sm
) {
1373 __set_true_false_sm(NULL
, sm
);
1374 } END_FOR_EACH_SM(sm
);
1377 void function_comparison(struct expression
*left
, int comparison
, struct expression
*right
)
1379 struct expression
*var_expr
;
1380 struct expression
*call_expr
;
1381 struct stree
*implied_true
= NULL
;
1382 struct stree
*implied_false
= NULL
;
1383 struct range_list
*rl
;
1387 // TODO: faked_assign delete this
1388 // condition calls should be faked and then handled as assignments
1389 // this code is a lazy work around
1394 /* legacy cruft. need to fix call_implies_callbacks(). */
1398 if (left
->type
!= EXPR_CALL
) {
1404 get_absolute_rl(var_expr
, &rl
);
1406 if (rl_to_sval(rl
, &sval
))
1407 call_implies_callbacks(comparison
, call_expr
, sval
, call_on_left
, &implied_true
, &implied_false
);
1409 compare_db_return_states_callbacks(left
, comparison
, right
, implied_true
, implied_false
);
1410 free_stree(&implied_true
);
1411 free_stree(&implied_false
);
1414 static void call_ranged_return_hooks(struct db_callback_info
*db_info
)
1416 struct call_back_list
*call_backs
;
1417 struct range_list
*range_rl
;
1418 struct expression
*expr
;
1419 struct fcall_back
*tmp
;
1420 const char *fn_name
;
1422 expr
= strip_expr(db_info
->expr
);
1423 while (expr
->type
== EXPR_ASSIGNMENT
)
1424 expr
= strip_expr(expr
->right
);
1425 if (expr
->type
!= EXPR_CALL
)
1428 fn_name
= get_fn_name(expr
->fn
);
1429 call_backs
= get_call_backs(fn_name
);
1430 FOR_EACH_PTR(call_backs
, tmp
) {
1431 if (tmp
->type
!= RANGED_CALL
)
1433 range_rl
= alloc_rl(tmp
->range
->min
, tmp
->range
->max
);
1434 range_rl
= cast_rl(estate_type(db_info
->ret_state
), range_rl
);
1435 if (possibly_true_rl(range_rl
, SPECIAL_EQUAL
, estate_rl(db_info
->ret_state
)))
1436 (tmp
->u
.ranged
)(fn_name
, expr
, db_info
->expr
, tmp
->info
);
1437 } END_FOR_EACH_PTR(tmp
);
1439 FOR_EACH_PTR(call_backs
, tmp
) {
1440 if (tmp
->type
!= RANGED_EXACT
)
1442 if (!estate_rl(db_info
->ret_state
))
1445 range_rl
= alloc_rl(tmp
->range
->min
, tmp
->range
->max
);
1446 range_rl
= cast_rl(estate_type(db_info
->ret_state
), range_rl
);
1449 * If there is an returned value out of range then this is not
1450 * an exact match. In other words, "0,4096-ptr_max" is not
1451 * necessarily a valid match.
1454 if (remove_range(estate_rl(db_info
->ret_state
),
1455 rl_min(range_rl
), rl_max(range_rl
)))
1457 (tmp
->u
.ranged
)(fn_name
, expr
, db_info
->expr
, tmp
->info
);
1458 } END_FOR_EACH_PTR(tmp
);
1461 static int db_assign_return_states_callback(void *_info
, int argc
, char **argv
, char **azColName
)
1463 struct db_callback_info
*db_info
= _info
;
1464 struct range_list
*ret_range
;
1466 char *ret_str
, *key
, *value
;
1467 struct return_implies_callback
*tmp
;
1473 return_id
= atoi(argv
[0]);
1475 type
= atoi(argv
[2]);
1476 param
= atoi(argv
[3]);
1480 if (db_info
->prev_return_id
!= -1 && type
== INTERNAL
) {
1481 call_ranged_return_hooks(db_info
);
1482 set_return_assign_state(db_info
);
1483 process_return_states(db_info
);
1484 __push_fake_cur_stree();
1487 db_info
->prev_return_id
= return_id
;
1489 if (type
== INTERNAL
&& func_type_mismatch(db_info
->expr
, value
))
1493 if (type
== CULL_PATH
) {
1497 if (is_impossible_data(type
, db_info
, param
, key
, value
)) {
1502 if (type
== PARAM_LIMIT
)
1503 param_limit_implications(db_info
->expr
, param
, key
, value
, &db_info
->implied
);
1504 else if (type
> PARAM_LIMIT
)
1505 set_implied_states(db_info
);
1507 db_info
->handled
= 1;
1508 call_results_to_rl(db_info
->expr
->right
, get_type(strip_expr(db_info
->expr
->right
)), ret_str
, &ret_range
);
1510 ret_range
= alloc_whole_rl(get_type(strip_expr(db_info
->expr
->right
)));
1511 ret_range
= cast_rl(get_type(db_info
->expr
->right
), ret_range
);
1513 if (type
== INTERNAL
) {
1514 set_state(-1, "unnull_path", NULL
, &true_state
);
1515 __add_comparison_info(db_info
->expr
->left
, strip_expr(db_info
->expr
->right
), ret_str
);
1516 call_string_hooks(return_string_hooks
, db_info
->expr
, ret_str
);
1517 store_return_state(db_info
, ret_str
, alloc_estate_rl(ret_range
));
1520 FOR_EACH_PTR(db_return_states_list
, tmp
) {
1521 if (tmp
->type
== type
)
1522 call_db_return_callback(db_info
, tmp
, param
, key
, value
);
1523 } END_FOR_EACH_PTR(tmp
);
1525 fake_return_assignment(db_info
, type
, param
, key
, value
);
1530 static int db_return_states_assign(struct expression
*expr
)
1532 struct expression
*right
;
1533 struct sm_state
*sm
;
1534 struct db_callback_info db_info
= {};
1536 right
= strip_expr(expr
->right
);
1538 db_info
.prev_return_id
= -1;
1539 db_info
.expr
= expr
;
1540 db_info
.stree
= NULL
;
1541 db_info
.handled
= 0;
1543 call_void_fns(return_states_before
);
1545 __push_fake_cur_stree();
1546 sql_select_return_states("return_id, return, type, parameter, key, value",
1547 right
, db_assign_return_states_callback
, &db_info
);
1549 sm_msg("%s return_id %d return_ranges %s",
1550 db_info
.cull
? "culled" : "merging",
1551 db_info
.prev_return_id
,
1552 db_info
.ret_state
? db_info
.ret_state
->name
: "'<empty>'");
1554 if (db_info
.handled
)
1555 call_ranged_return_hooks(&db_info
);
1556 set_return_assign_state(&db_info
);
1557 process_return_states(&db_info
);
1559 if (!db_info
.stree
&& db_info
.cull
) { /* this means we culled everything */
1560 set_extra_expr_mod(expr
->left
, alloc_estate_whole(get_type(expr
->left
)));
1561 set_path_impossible();
1563 FOR_EACH_SM(db_info
.stree
, sm
) {
1565 } END_FOR_EACH_SM(sm
);
1567 free_stree(&db_info
.stree
);
1569 if (!db_info
.states_merged
)
1570 mark_call_params_untracked(right
);
1572 call_return_states_after_hooks(right
);
1574 return db_info
.handled
;
1577 static bool handle_implied_return(struct expression
*expr
)
1579 struct range_list
*rl
;
1581 if (!get_implied_return(expr
->right
, &rl
))
1583 rl
= cast_rl(get_type(expr
->left
), rl
);
1584 set_extra_expr_mod(expr
->left
, alloc_estate_rl(rl
));
1588 static void match_assign_call(struct expression
*expr
)
1590 struct call_back_list
*call_backs
;
1591 const char *fn_name
;
1592 struct expression
*right
;
1594 struct range_list
*rl
;
1596 if (expr
->op
!= '=')
1599 right
= strip_expr(expr
->right
);
1600 if (is_fake_call(right
))
1603 fn_name
= get_fn_name(right
->fn
);
1604 call_backs
= get_call_backs(fn_name
);
1607 * The ordering here is sort of important.
1608 * One example, of how this matters is that when we do:
1610 * len = strlen(str);
1612 * That is handled by smatch_common_functions.c and smatch_strlen.c.
1613 * They use implied_return and function_assign_hook respectively.
1614 * We want to get the implied return first before we do the function
1615 * assignment hook otherwise we end up writing the wrong thing for len
1616 * in smatch_extra.c because we assume that it already holds the
1617 * strlen() when we haven't set it yet.
1620 if (db_return_states_assign(expr
))
1623 handled
= assign_ranged_funcs(fn_name
, expr
, call_backs
);
1624 handled
|= handle_implied_return(expr
);
1627 call_call_backs(call_backs
, ASSIGN_CALL
, fn_name
, expr
);
1632 /* assignment wasn't handled at all */
1633 get_absolute_rl(expr
->right
, &rl
);
1634 rl
= cast_rl(get_type(expr
->left
), rl
);
1635 set_extra_expr_mod(expr
->left
, alloc_estate_rl(rl
));
1638 static int db_return_states_callback(void *_info
, int argc
, char **argv
, char **azColName
)
1640 struct db_callback_info
*db_info
= _info
;
1641 struct range_list
*ret_range
;
1643 char *ret_str
, *key
, *value
;
1644 struct return_implies_callback
*tmp
;
1650 return_id
= atoi(argv
[0]);
1652 type
= atoi(argv
[2]);
1653 param
= atoi(argv
[3]);
1657 if (db_info
->prev_return_id
!= -1 && type
== INTERNAL
) {
1658 call_ranged_return_hooks(db_info
);
1659 process_return_states(db_info
);
1660 __push_fake_cur_stree();
1664 db_info
->prev_return_id
= return_id
;
1666 if (type
== INTERNAL
&& func_type_mismatch(db_info
->expr
, value
))
1670 if (type
== CULL_PATH
) {
1674 if (is_impossible_data(type
, db_info
, param
, key
, value
)) {
1679 if (type
== PARAM_LIMIT
)
1680 param_limit_implications(db_info
->expr
, param
, key
, value
, &db_info
->implied
);
1681 else if (type
> PARAM_LIMIT
)
1682 set_implied_states(db_info
);
1684 call_results_to_rl(db_info
->expr
, get_type(strip_expr(db_info
->expr
)), ret_str
, &ret_range
);
1685 ret_range
= cast_rl(get_type(db_info
->expr
), ret_range
);
1687 if (type
== INTERNAL
) {
1688 struct smatch_state
*state
;
1690 set_state(-1, "unnull_path", NULL
, &true_state
);
1691 call_string_hooks(return_string_hooks
, db_info
->expr
, ret_str
);
1692 state
= alloc_estate_rl(ret_range
);
1693 store_return_state(db_info
, ret_str
, state
);
1696 FOR_EACH_PTR(db_return_states_list
, tmp
) {
1697 if (tmp
->type
== type
)
1698 call_db_return_callback(db_info
, tmp
, param
, key
, value
);
1699 } END_FOR_EACH_PTR(tmp
);
1701 fake_return_assignment(db_info
, type
, param
, key
, value
);
1706 static void db_return_states(struct expression
*expr
)
1708 struct sm_state
*sm
;
1709 struct db_callback_info db_info
= {};
1711 if (!__get_cur_stree()) /* no return functions */
1714 db_info
.prev_return_id
= -1;
1715 db_info
.expr
= expr
;
1716 db_info
.stree
= NULL
;
1718 call_void_fns(return_states_before
);
1720 __push_fake_cur_stree();
1722 sql_select_return_states("return_id, return, type, parameter, key, value",
1723 expr
, db_return_states_callback
, &db_info
);
1724 call_ranged_return_hooks(&db_info
);
1725 process_return_states(&db_info
);
1727 FOR_EACH_SM(db_info
.stree
, sm
) {
1729 } END_FOR_EACH_SM(sm
);
1731 free_stree(&db_info
.stree
);
1733 if (!db_info
.states_merged
)
1734 mark_call_params_untracked(expr
);
1736 call_return_states_after_hooks(expr
);
1739 static void db_return_states_call(struct expression
*expr
)
1744 if (is_assigned_call(expr
) || is_fake_assigned_call(expr
))
1746 if (is_condition_call(expr
))
1748 db_return_states(expr
);
1751 static void match_function_call_early(struct expression
*expr
)
1753 call_function_hooks(expr
, REGULAR_CALL_EARLY
);
1756 static void match_function_call(struct expression
*expr
)
1758 call_function_hooks(expr
, REGULAR_CALL
);
1759 db_return_states_call(expr
);
1760 /* If we have no database there could be unprocessed fake calls */
1764 static void match_macro_assign(struct expression
*expr
)
1766 struct call_back_list
*call_backs
;
1768 struct expression
*right
;
1770 right
= strip_expr(expr
->right
);
1771 macro
= get_macro_name(right
->pos
);
1772 call_backs
= search_callback(func_hash
, (char *)macro
);
1775 call_call_backs(call_backs
, MACRO_ASSIGN
, macro
, expr
);
1776 call_call_backs(call_backs
, MACRO_ASSIGN_EXTRA
, macro
, expr
);
1779 bool get_implied_return(struct expression
*expr
, struct range_list
**rl
)
1781 struct call_back_list
*call_backs
;
1782 struct fcall_back
*tmp
;
1783 bool handled
= false;
1788 expr
= strip_expr(expr
);
1789 fn
= expr_to_var(expr
->fn
);
1793 call_backs
= search_callback(func_hash
, fn
);
1795 FOR_EACH_PTR(call_backs
, tmp
) {
1796 if (tmp
->type
== IMPLIED_RETURN
)
1797 handled
|= (tmp
->u
.implied_return
)(expr
, tmp
->info
, rl
);
1798 } END_FOR_EACH_PTR(tmp
);
1805 struct range_list
*get_range_implications(const char *fn
)
1807 struct call_back_list
*call_backs
;
1808 struct range_list
*ret
= NULL
;
1809 struct fcall_back
*tmp
;
1811 call_backs
= search_callback(func_hash
, (char *)fn
);
1813 FOR_EACH_PTR(call_backs
, tmp
) {
1814 if (tmp
->type
!= RANGED_CALL
&&
1815 tmp
->type
!= RANGED_EXACT
)
1817 add_ptr_list(&ret
, tmp
->range
);
1818 } END_FOR_EACH_PTR(tmp
);
1823 void create_function_hook_hash(void)
1825 func_hash
= create_function_hashtable(5000);
1828 void register_function_hooks_early(int id
)
1830 add_hook(&match_function_call_early
, FUNCTION_CALL_HOOK_BEFORE
);
1833 void register_function_hooks(int id
)
1835 add_function_data((unsigned long *)&fake_calls
);
1836 add_hook(&match_function_call
, CALL_HOOK_AFTER_INLINE
);
1837 add_hook(&match_assign_call
, CALL_ASSIGNMENT_HOOK
);
1838 add_hook(&match_macro_assign
, MACRO_ASSIGNMENT_HOOK
);